In 10 seconds or less, I have a strong preference for keeping Mexico in the negotiation. We're all linked together physically. We're linked together economically and commercially, and we all share the same space on the planet together, so there is a strong preference to keep it together. However, if you can't, I wouldn't sacrifice a good Canada-U.S. deal because the pace at which we both negotiate with Mexico is different. Eventually, we all will work together, but I would love to have Mexico in it.
There may be a TPP without the United States, in which Canada and Mexico could modernize a few things, and the U.S. could perhaps bolt on to that.